Night Pearl shifted from the bayonet-type mounting standard used on the first-generation Seer to the thread-type mounting standard (M43x0.75) – they have used it on all their clip-ons since, hence the name of this standard. This standard is also used on some devices made by Liemke. All the adapters made for it are of the two-piece type – you need to pair a reduction ring (converter) with an adapter that is typically designed for the Dedal mounting standard (M52x0.75). All the clip-ons that feature this mounting standard are front-mounted, meaning that they are mounted on the riflescope’s objective.
Night Pearl mounting standard (M43x0.75) on Liemke Luchs 1
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With Smartclip, Rusan, Recknagel, and Präzise Jagen adapters you need to choose the size based on the outer objective diameter of the riflescope.
Our list of riflescopes and their outer objective diameters is available here
Rusan reducing ring for the Night Pearl standard can be paired with Rusan, Smartclip and Recknagel adapter for the M52x0.75 mounting standard.
Our article with all the mounting standards on NV and thermal clip-on devices is available here